Classifications

• • E—FIXED CONSTRUCTIONS
  • E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
  • E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
  • E02D31/00—Protective arrangements for foundations or foundation structures; Ground foundation measures for protecting the soil or the subsoil water, e.g. preventing or counteracting oil pollution
  • E02D31/002—Ground foundation measures for protecting the soil or subsoil water, e.g. preventing or counteracting oil pollution
  • E02D31/004—Sealing liners

Definitions

• the invention relates to a sealing mat, consisting of a carrier sheet, a layer of swellable clay, in particular bentonite, applied thereon and a cover sheet, both sheets being textile sheets and the cover sheet with the carrier sheet penetrating the clay layer and the two textile sheets at a distance holding seams is connected.
• Sealing mats of this type are known from US Patents 4,565,468 and 5,564,864. Because, on the one hand, the textile carrier sheet or the textile cover sheet are not dustproof and, on the other hand, bentonite powder emerges during the sewing process from the puncture holes created during the sewing process, the outer surfaces of such sealing sheets are covered with bentonite dust. If, when installed, water acts on the sealing membrane from below or also from above, the bentonite dust layer swells on the outside of the sealing mats and thus forms a lubricating film, which causes the soil on the sealing mat or this soil together with the Sealing mat can slide off.
• the invention has for its object to provide a sealing mat that has a higher static friction compared to its base and / or its support.
• At least one textile web is a fabric web that is strongly structured at least on the outer side to increase the static friction and has projections or ribs evenly distributed over the surface, which protrude at least 0.2 mm.
• the projections or ribs located on the outside of the sealing mat lie positively in the soil, so that good adhesion of the soil to these outer sides is ensured, even if there is a lubricating film between the ribs and projections.
• the projections or ribs according to the invention also improve the adhesion of the sealing mat to a geo-plastic film on which the sealing mat can be placed or which covers the sealing mat.
• the fabric web can be a ribbon fabric which is formed from polypropylene strips or polyethylene strips.
• the fabric sheet is calendered to increase the tightness using heat and pressure.
• the pores between the interwoven threads close.
• grooves can be embossed in the tape fabric using heat and pressure, some of which run in the warp direction and some in the weft direction.
• weft threads and / or warp threads can be woven into the fabric web at intervals of, for example, 30 or 50 mm.
• the warp threads and weft threads forming the projections or ribs can also be twisted strands.
• An advantageous embodiment of the invention is that grains of sand are glued to the outside of the fabric web. Strips or stains made of latex or another binder, in which coarse-grained sand or sharp-edged grit grains are held, can be attached to the fabric web on the outer side in each case.
• the swellable clay of the intermediate layer is incorporated in a known manner in an aero fleece or in an open-cell foam layer, and the carrier sheet, the intermediate layer and the cover sheet are connected to one another via seams running in the longitudinal direction of the sealing mat, which are spaced, for example, 20-50 mm .
• the fabric of the carrier sheet and / or the fabric of the cover sheet can be coated over the entire area with a sealing layer made of latex or plastic, in particular polypropylene or polyurethane.
• a sealing layer made of latex or plastic, in particular polypropylene or polyurethane.
• the carrier sheet and the cover sheet also have a sealing effect, and the bentonite intermediate layer serves to absorb the water penetrating through the puncture holes in the seams and to seal these seams after swelling.
• the object on which the invention is based can also be achieved in that at least one textile web is a scrim, which has a first layer parallel threads and a second layer of parallel threads crossing the threads of the first layer is formed, the layers being fixed to one another by seams and that at least on the outer side in each case, the layer of threads is strongly structured and has projections or ribs evenly distributed over the surface, which preferably protrude 0.4 mm.
• This scrim can also be formed from polypropylene or polyethylene tapes or strips.
• heated, liquid plastic in particular PP, PE or PVC in the form of drops, can also be applied to the outside of the laid scrim.
• At least 10 mm to 50 mm thick threads can also be inserted into the crossing layers in this laid scrim at intervals of, for example, 10 to 50 mm. These thicker threads form ribs and also protrusions at the crossing points of the thick threads.
• At least one textile web comprises a textile grid, e.g. Mesh fabric or Raschelware, with a mesh size of 1 mm to 25 mm and that a plastic film is arranged between the intermediate layer of swellable clay and the textile grid.
• the textile grid forms the ribs that press into the ground.
• the sealing mat formed in this way can also absorb high tensile forces.
• the thicker threads that form the protruding ribs can also be reinforcing threads at the same time.
• the sealing mat according to the invention has the advantage that, with the same thickness, the intermediate layer made of swellable clay is considerably thicker, which means that either a better seal is achieved or a less swellable clay than Na bentonite can also be used.
• Fig. 1 shows a cross section
• FIG. 2 shows a top view of a sealing membrane according to the invention
• FIG. 3 shows a top view of a second embodiment of the sealing mat according to the invention
• FIG. 5 is a view along the section line V-V in Fig. 4,
• FIG. 6 shows a top view of a sealing mat according to the invention with latex spots
• FIG. 7 shows a top view of a sealing mat according to the invention with a
• FIG. 8 is a plan view of a sealing mat with a cover sheet sewn over in a herringbone pattern.
• FIG. 1 and 2 show a partial section of a sealing mat, which is composed of a carrier sheet 1, a layer 2 of swellable clay applied thereon and a cover sheet 3, which are connected to the carrier sheet 1 by spacing seams 4.
• the carrier web 1 and the top web 3 are fabric webs which are strongly structured on the outer sides and have ribs 6 in order to achieve better adhesion to the ground.
• the ribs 6 can be formed by warp threads or weft threads woven in at intervals of, for example, 30 or 60 mm.
• Fig. 3 are on the outside of a cover sheet 3 projections 5, which are formed by dropping thermoplastic material.
• 4 shows a laid scrim 10 which is formed by a first layer 11 of parallel threads and a second layer 12 of parallel threads crossing the threads of the first layer 11.
• the two layers 11 and 12 are connected to one another by seams 13, which are produced by sewing or sewing.
• the threads of the layers 11 and 12 can be plastic strips, in particular polypropylene or polyethylene tapes.
• threads 14 and 15 can be inserted into the layers 11 and 12 of the scrim 10 at intervals of, for example, 40 mm.
• the seams 13, which fix the crossing thread layers 11, 12, can be formed with a relatively thick monofilament plastic thread, which forms rib-like projections on the outside.
• the seams 13 and the rib-like projections can extend in two directions crossing at an angle of 90 °.
• the plastic thread for the seams 13 is advantageously triangular or quadrangular. This thread profile increases the adhesion of the ribbon fabric or laid scrim to the ground.
• FIG. 6 shows a sealing mat with a carrier sheet 1, an intermediate layer 2 made of bentonite and a cover sheet 3, which is connected to the carrier sheet 1 via seams 4.
• the carrier arm 1 and the cover sheet 3 have latex spots 8 on the outer side, in which coarse-grained sand or sharp-edged chippings are held.
• a scrim 10 made of plastic tapes can be provided on the outside with latex stains 8, in which grains of sand or grit are held.
• strips of a binder running parallel to the seams 4 can also be applied to the carrier web 1 and the top web 3 and sand spray nozzles when sanding the seams 4 onto these strips.
• the setting of the binder can be accelerated by inflated hot air.
• FIG. 7 is an illustration in which the individual layers of a sealing mat are cut away in a top view from top to bottom.
• a plastic film 19 underneath this follows the intermediate layer 2 made of swellable clay, then another plastic film 19 and the carrier sheet 1.
• the carrier sheet 1 and cover sheet 3 consist of a mesh fabric with a mesh opening of approximately 10 mm.
• plastic films 19 are arranged between them the intermediate layer 2 is made of swellable clay.
• the three layers are sewn together.
• the seams 4 can be attached using sewing technology, sewing technology or Raschel technology. Instead of a lattice fabric, a lattice-like thread can also be used.
• the textile grid (fabric or scrim) can be coated with PVC or a similar plastic, which considerably increases the static friction compared to a geo-plastic film.
• the lattice structure of the carrier web 1 and the top web 3 results in very good adhesion to the floor.
• the carrier web 1 and / or the top web 3 consists of a fabric or thread scrim that is smooth on the outside, then - as shown in FIG. 8 - the adhesion to the underlying and overlying soil can be improved in that the fabric or the thread scrim with a thick , in particular monofilament plastic thread 20 is sewn over, the sewing thread 20 overlapping the outside of the fabric or laid scrim per stitch over a distance of 3 to 6 mm.
• the plastic thread can be applied using sewing or Raschel technology and - as shown - form a herringbone pattern.
• the plastic thread that brings about better adhesion is applied using a stitching technique with tricot binding.

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• Engineering & Computer Science (AREA)
• Environmental & Geological Engineering (AREA)
• Life Sciences & Earth Sciences (AREA)
• Paleontology (AREA)
• General Life Sciences & Earth Sciences (AREA)
• Mining & Mineral Resources (AREA)
• Hydrology & Water Resources (AREA)
• Civil Engineering (AREA)
• General Engineering & Computer Science (AREA)
• Structural Engineering (AREA)
• Laminated Bodies (AREA)
• Carpets (AREA)
• Passenger Equipment (AREA)
• Thermotherapy And Cooling Therapy Devices (AREA)
• Road Paving Structures (AREA)

Priority Applications (4)

Applications Claiming Priority (2)

Publications (1)

Family

ID=7840857

Family Applications (1)

Country Status (6)

Families Citing this family (7)

Citations (4)

• 1997
  • 1997-09-01 DE DE19738169A patent/DE19738169A1/de not_active Withdrawn
• 1998
  • 1998-08-31 DE DE59805026T patent/DE59805026D1/de not_active Expired - Fee Related
  • 1998-08-31 JP JP2000508862A patent/JP2001514980A/ja active Pending
  • 1998-08-31 AT AT98947485T patent/ATE221601T1/de not_active IP Right Cessation
  • 1998-08-31 EP EP98947485A patent/EP1009885B1/de not_active Expired - Lifetime
  • 1998-08-31 ES ES98947485T patent/ES2180202T3/es not_active Expired - Lifetime
  • 1998-08-31 WO PCT/EP1998/005516 patent/WO1999011873A1/de active IP Right Grant

Patent Citations (4)

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